Asked by susan
Expand the brackets in the following expression
(5y-3)^2
My answer is 5y^2-3^2
The answer i worked out seems to simple but is it correct? If not can someone tell me what i need to do. thanks
(5y-3)^2
My answer is 5y^2-3^2
The answer i worked out seems to simple but is it correct? If not can someone tell me what i need to do. thanks
Answers
Answered by
Dr Russ
You have not multiplied out the brackets
(5y-3)^2 =(5y-3)(5y-3)
(5y-3)(5y-3)= (5y)^2-(2.3.5y)+3^2
(5y)^2-(2.3.5y)+3^2 = 25y^2-30y+9
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